1 Introduction. - 1. 1 Scope of the book. - 1. 2 Definitions. - 1. 3 Migmatites and granites. - 1. 4 Melt-absent migmatization. - 1. 5 Compositions of anatectic leucosomes. - 1. 6 Textures and structures as possible indicators of melt presence. - 1. 7 Estimation of P-T -aH2O conditions. - 1. 8 The Granulite Facies. - 1. 9 Mineral compositions in leucosome and melanosome: the plagioclase problem. - 1. 10 Open and closed systems. - 1. 11 Conclusions. - References. - 2 The significance of experimental studies for the formation of migmatites. - 2. 1 Introduction. - 2. 2 Experimental studies in the haplogranite system Qz-Or-Ab-H20. - 2. 3 Experimental studies in the tonalite system Qz-Ab-An-H2O. - 2. 4 Experimental studies in the granite system Qz-Or-Ab-An-H2O. - 2. 5 Plagioclase compositions: observations in nature experimental findings and conclusions. - 2. 6 Suggestions for future research. - References. - 3 Phase equilibria in partial melting of pelitic rocks. - 3. 1 Introduction. - 3. 2 Subsolidus phase equilibria and experimental data. - 3. 3 Partial melting. - 3. 4 Melting at PH2O =Ptotal. - 3. 5 Melting at PH2O < Ptotal. - 3. 6 Vapour-absent melting. - 3. 7 Internal and external control of intensive variables. - 3. 8 Paths through time and space. - 3. 9 Separation of solid liquid and vapour. - 3. 10 Summary liquidus relations. - 3. 11 Conclusions. - References. - 4 Mass balance in migmatites. - 4. 1 Introduction. - 4. 2 Baltimore Gneiss and Front Range migmatites. - 4. 3 Mass-balance calculations: methods and assumptions. - 4. 4 Mass-balance calculations: results. - 4. 5 Littleton Formation migmatites. - 4. 6 Discussion. - References. - 5 Textures. - 5. 1 Introduction. - 5. 2 Grain size. - 5. 3 Textures attributed to crystallization from a melt. - 5. 4 Grain shape. - 5. 5 Grain orientation (petrofabric). - 5. 6 Grain contact relations. - 5. 7 Conclusions. - References. - 6 Migmatite occurrences in New England. - 6. 1 Introduction. - 6. 2 Tectonic evolution of New England. - 6. 3 Grenville massifs of western New England. - 6. 4 Ordovician migmatites in the western high grade belt. - 6. 5 Migmatites of the eastern Acadian metamorphic high. - 6. 6 Avalonian terrains overprinted in the Alleghenian. - 6. 7 Summary. - References. - 7 Migmatites in the Moines. - 7. 1 Introduction. - 7. 2 Early migmatites. - 7. 3 Late migmatites. - 7. 4 Sutherland migmatites. - 7. 5 Conclusions. - References. - 8 Fluid inclusions in migmatites. - 8. 1 Introduction. - 8. 2 Fluid inclusions in migmatites of Bamble Norway. - 8. 3 Fluid inclusions in the Front Range migmatites. - 8. 4 Possible melt inclusions in migmatites. - 8. 5 Discussion. - References. - Index of authors cited. Language: English